FROMGIT: kbuild: reuse suffix-search to refactor multi_depend

The complicated part of multi_depend is the same as suffix-search.

Reuse it.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

Bug: 175420575
(cherry picked from commit db6836b669fb7c4a214e967e3985db05d85f2a24
 https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git

 kbuild)
Change-Id: I7966897a0151a08d003f53d20adaf3fb40028442
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>